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A couple reasons:
*the AC would probably kill the battery in about 20-30 minutes, the average heater would last about twice that. Not to mention the lights in the sleeper, TV, DVD player, Laptop Computers, refridgerator and so on.
*The large diesel engines go thru a ton of wear and tear when starting. It's much easier on the engine to leave it running.
I would guess (and this is just a guess) that during 6 hours of idling the engine might burn thru 3-5 gallons of diesel fuel. What's that about $8?
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The Truth:
Johnny Cash could have kicked Bruce Lee's ass if he wanted to.
#3 in a series
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